We get calls from homeowners who swear their house is sinking. More often than not, the floors are just sloped, the doors are sticking, and there’s a crack running across the drywall that wasn’t there last year. The real question isn’t whether the house is sinking—it’s whether you can fix it without turning your life upside down. We’ve seen the panic, the bad advice from well-meaning contractors, and the outright scams. So let’s talk about the best way to level a house, based on what we’ve actually done in the field, not what sounds good in a marketing brochure.

The best way to level a house depends entirely on what’s causing the movement. For most homes with foundation settlement, the solution involves installing push piers or helical piers to stabilize the foundation, then lifting it back to level in controlled stages. For slab-on-grade homes with minor settling, mudjacking or polyurethane foam injection can work, but only if the soil conditions are right. For wood-framed structures on crawlspaces, you’re often looking at adjusting or replacing support posts and shimming the floor joists. The wrong approach can crack your foundation, break your plumbing, or waste thousands of dollars.

Key Takeaways

• Foundation leveling is not a DIY project—most attempts end up costing more in repairs than a professional job.
• The method that works depends on your foundation type, soil conditions, and the severity of the settlement.
• Push piers are the most reliable long-term solution for serious settling, but they’re not always necessary.
• Mudjacking and foam injection are faster and cheaper, but they have real limitations.
• Always get a structural engineer’s assessment before spending money on any leveling method.

Why Your House Is Uneven in the First Place

Let’s clear up a common myth right away. A house doesn’t just “settle” evenly over time. If you’ve got a floor that slopes noticeably from one wall to the other, something specific is happening beneath the foundation. The most common culprit is soil movement. In Denver, we deal with expansive clay soils that swell when wet and shrink when dry. That constant push-pull can shift a foundation slab over the years. Add in poor drainage around the house, and you’ve got a recipe for uneven settlement.

Another frequent cause is poor compaction of the soil before the foundation was poured. Builders sometimes rush the backfill process, leaving voids that eventually collapse under the weight of the house. We’ve seen homes less than ten years old with six inches of differential settlement because the builder skimped on compaction. Then there’s tree roots, plumbing leaks that wash out soil, and frost heave in colder climates. The point is, you can’t pick the right leveling method until you know why the house moved.

The Foundation Type Dictates the Approach

Not all foundations are created equal, and neither are the leveling methods that work on them. We’ve broken this down into three main categories because we’ve seen too many homeowners get sold a solution that doesn’t match their setup.

Slab-on-Grade Foundations

This is the most common foundation type in newer construction, especially in the western U.S. The concrete slab is poured directly onto the ground, and the house sits right on top of it. When a slab settles, you usually see cracks in the floor or walls, doors that won’t close properly, and a noticeable slope in the living room.

For slabs, the two main leveling options are mudjacking and polyurethane foam injection. Mudjacking involves pumping a slurry of cement, sand, and water under the slab to fill voids and lift it. It’s been around for decades, and it works reasonably well for minor settlement—say, less than two inches. But it has drawbacks. The slurry is heavy, so it can actually add more load to already weak soil. It also takes a couple of days to cure, and it can be messy.

Polyurethane foam injection is the newer kid on the block. A two-part foam is injected through small holes, and it expands to fill voids and lift the slab. It’s lighter than mud, cures in minutes, and can be precisely controlled. But it’s more expensive, and if the foam is injected into the wrong area, it can crack the slab instead of lifting it evenly. We’ve had to fix jobs where a foam contractor lifted one corner of a slab so aggressively that it snapped the plumbing line underneath.

For slabs that have settled more than three inches, or where the soil has significant voids, neither mudjacking nor foam is a permanent fix. You’re better off with push piers, which are steel shafts driven down to stable soil or bedrock, then used to lift and support the slab. It’s a bigger job, but it’s the only solution that addresses the root cause.

Crawlspace and Basement Foundations

Homes with crawlspaces or basements typically have a different problem. The foundation walls might be fine, but the interior support posts or the floor joists have shifted. This is often a simpler fix. You can adjust the jacks on the support posts, or replace rotted or undersized posts with new ones. In some cases, we’ve had to sister new joists alongside the old ones to provide even support.

The tricky part here is that homeowners often assume the whole house needs to be lifted. In reality, you might only need to shore up a few points. We had a customer in the Washington Park neighborhood of Denver who was convinced their foundation was failing. Turned out, a single support post in the crawlspace had rotted at the base, and the floor joists were sagging over a span of about eight feet. We replaced the post, shimmed the joists, and the floor was level in an afternoon. Cost them under a thousand dollars, not the ten thousand they were expecting.

Pier-and-Beam Foundations

These are common in older homes, especially those built before the 1960s. The house is supported by a series of concrete piers with wooden beams spanning between them. Over time, the piers can settle unevenly, or the beams can rot or sag. Leveling a pier-and-beam house usually involves either lifting the beam and adding new support, or replacing the piers entirely.

This is one area where we’ve seen DIY attempts go badly. People try to jack up the beam with a car jack, and they end up cracking the plaster or breaking a window because they lifted too fast. The right way is to use a series of hydraulic jacks, lift in small increments, and install permanent support posts or adjustable steel columns. It’s tedious work, but it’s the only way to get a level floor without collateral damage.

The Real Cost of Doing It Wrong

We’ve seen the aftermath of bad leveling jobs more times than we care to count. One that sticks in my mind was a house in the Hilltop neighborhood. The owner had hired a handyman to “fix” the sloping floor by driving shims under the bottom plate of the wall. It looked fine for about six months. Then the shims started to compress, the wall cracked, and the floor got worse than before. The handyman had actually pushed the wall upward without addressing the foundation settlement underneath, so the whole structure was now torqued in a way that was harder to fix.

The lesson is that leveling a house isn’t cosmetic. It’s structural. If you don’t address the underlying cause, you’re just rearranging deck chairs. And if you lift too fast or unevenly, you can break plumbing lines, crack the drywall, or even separate the roof from the walls. We’ve had to re-level houses that were lifted by contractors who didn’t understand the load distribution. It’s a mess.

When to Call a Professional (and When You Can Skip It)

We’re not going to tell you that every uneven floor requires a professional. Sometimes, a house settles a little, and it’s not a big deal. If you’ve got a quarter-inch slope over ten feet, and no cracks in the walls or plumbing issues, you can probably live with it. But if you’ve got doors that won’t close, cracks wider than a quarter-inch, or a floor that feels like a funhouse, it’s time to call someone.

The rule of thumb we use is this: if the slope is less than one inch over twenty feet, and it’s not getting worse, monitor it. If it’s more than that, or if you see active movement, get a structural engineer involved. Don’t call a foundation repair company first. Call an engineer. They’ll give you an unbiased assessment of what’s happening and what needs to be done. Then you can get bids from contractors who know what they’re doing.

Comparing the Main Leveling Methods

We’ve put together a table that breaks down the most common leveling methods based on what we’ve seen work and fail in the field. This isn’t theoretical—it’s based on hundreds of jobs.

The cost ranges are rough estimates for the Denver area. Your mileage will vary depending on access, soil conditions, and the size of your home. But the pattern is clear: the cheaper methods are temporary fixes, and the expensive ones are permanent.

How We Approach a Leveling Job

When we get a call about an uneven floor, the first thing we do is walk the house with a level and a laser. We mark the high and low spots, and we look for cracks in the foundation, the drywall, and the exterior brick. Then we check the crawlspace or basement for signs of moisture, rot, or pest damage. We also look at the drainage around the house—are the gutters clogged? Is the soil sloping toward the foundation? Nine times out of ten, fixing the drainage will stop the settlement from getting worse, even if you don’t level the house.

If the settlement is active, we recommend a structural engineer’s report. That’s not a sales pitch—we genuinely want to know what we’re dealing with before we start lifting. Once we have the report, we decide on the method. For most homes in Denver, with our clay soils and freeze-thaw cycles, push piers are the go-to for serious problems. They go down to stable soil, usually around 20 to 40 feet deep, and they give us a solid anchor to lift from.

The actual lifting process is slow. We raise the house in increments of about an eighth of an inch at a time, then wait for the structure to settle before lifting again. It can take a full day to lift a house a couple of inches. But that’s how you avoid cracking the drywall or breaking the plumbing. We’ve seen contractors try to rush it, and the results are never pretty.

Common Mistakes We See Homeowners Make

Let’s run through a few that come up over and over.

First, ignoring the drainage. You can spend ten grand on piers, but if your downspouts are dumping water against the foundation, you’ll be back in five years with the same problem. Fix the water first.

Second, assuming a cracked slab means the whole foundation is failing. Slabs crack from shrinkage during curing, from temperature changes, and from minor soil movement. Not every crack is a structural emergency. If the crack is hairline and hasn’t changed in years, leave it alone.

Third, going with the cheapest bid. Foundation leveling is not a commodity. The cheapest contractor is usually the one who skips the engineering, uses the wrong materials, or rushes the job. We’ve had to redo work from low-bid contractors more times than we can count. The savings aren’t savings when you have to pay twice.

Fourth, trying to DIY. We get it—everyone wants to save money. But we’ve seen people try to level a house with bottle jacks and 2x4s, and it never ends well. The house is heavier than you think, and the forces involved can be dangerous. Leave it to the pros.

When Leveling Isn’t the Answer

This is an important point that doesn’t get talked about enough. Sometimes, the best decision is not to level the house at all. If the movement has stopped, and the house is stable, you might be better off just fixing the cosmetic issues. Patch the cracks, adjust the doors, and live with the slope. Leveling a house that’s already stable can actually cause more problems than it solves, because you’re introducing new stresses into the structure.

We had a customer in the Highlands whose house had a noticeable slope in the dining room. The house was built in 1925, and the slope had been there for decades. The foundation was solid, the walls weren’t cracking, and the doors all worked. We told them to leave it alone. They were a little disappointed, but they saved fifteen thousand dollars. Sometimes the right answer is “do nothing.”

Closing Thoughts

Leveling a house isn’t magic, and it’s not something you can learn from a YouTube video. It’s a structural intervention that requires understanding the soil, the foundation, and the loads involved. The best way to level a house is to first understand why it moved, then pick the method that addresses the cause, not just the symptom. And if you’re in Denver, with our clay soils and aging housing stock, that usually means calling a professional who’s done it before.

If you’re sitting in a house with a sloping floor and wondering what to do, start with a structural engineer. Get the facts. Then make a decision based on what’s actually happening, not what you’re afraid might happen. And if you decide to move forward, make sure the contractor you hire has the experience to do it right. Bedrock Foundation Builders located in Denver, Co has seen enough bad jobs to know that the right way is the only way that saves you money in the long run.